Fuse



FUSE

Filed my 7, 1927 ga@ ,5372i F00,

Patented Apr. 8, 1930 LEE SING F00, F MANCHESTER, NEW HAMPSHIRE FUSE Application led May 7, 1927. Serial No. 189,588.

My invention relates to fuses and more particularly to electric fuses adapted for use in house current.

An important object of the invention is to provide a fuse of this character provided with a plurality of fusible links which may be automatically moved into the electric circuit so as to provide an unbroken fusible link should one of the links become fused.

A further object is to provide a fuse plug having a fuse link magazine rotatably mounted therein and operated by a link arranged within the plug whereby it successively moves 4 the link into the circuit as the same becomes broken.

Another object is to provide a device of this character of relatively simple construction, eiicient in performance, easily accessible for the renewal of the broken link and inexpensive to manufacture. l

Other objects and advantages reside in vthe special construction, combination and arrangement of the various elements forming the invention as more fully hereinafter described and claimed, reference being had to the accompanying drawingsr forming part hereof whereinl like numerals refer to like parts throughout, and in which Figure 1 is a longitudinal sectional view,

Figure 2 is a transverse sectional view taken along the line 2-2 of Figure 1,

l Figure 3 is an inner end view of the rotating magazine, and

Figure 4 is an end elevational view of the outer end of the magazine showing the fuse indicatin indicia.

Referring now to the drawings, I have shown my invention comprising a fuse plug body 5 preferably constructed of .porcelain or other non-conductive material and of substantially hollow construction throughout. One end of the body is reduced and provided with a metallic threaded sleeve 6 ada ted to be fitted within the electric socket an forming one of the contacts for the-electric circuit. A pin 7 is longitudinally arranged Within the plug having a head 8 forming the other contact for the circuit. The opposite end of the pin isinserted in a bore formed 'within a fuse 5 link magazine 9 arranged within the body and rotatable upon the pin. The outer end of this magazine is provided with a recess within which the pin partially extends and is secured therein by a screw 1() threadedly inserted in the end of the pin. A spring 11 55 is arranged upon the end of the pin and retained under pressure by' a washer 12 secured by the screw whereby to tensionally hold themagazine within the plug.

Flanges 13 are formed at each end of the 60 magazine having openings formed therein and adapted to receive the opposite end of fusible link y141. The end of the link 15 carried by the outer flange is secured thereto by a screw 16 and the opposite end of the link 17 extends slightly beyondthe edge of the ange soa-s to form a Contact with a brush 18 slidably arranged within a recess at the reduced end of the plug and having its ends rounded in order to permit the sliding of the end of the link 17 thereover. pin 19 is formed on the brush and is connected to the threaded sleeve 6 by means of a short wire 20. A spring 21 arranged Within the recess forces the brush in contact with the end of the link 17 and per- 75 mits the riding of the link thereover upon the rotation of the magazine.

Upon the outermost end of the magazine is arranged a metallic disc 22, secured thereto by the screws 16. This is provided with a centrally disposed well 23 having an opening through which the end of the pin 7 is inserted.

A cap 24 is fitted over the end ofthe plug having an opening 25 formed therein, the opening permitting inspection within the plug so as to permit the reading of indicia arranged upon the face of the disc 22. The indicia is arranged to correspond to the links carried by the magazine.

I At theinner end of the magazine is ar- 9 ranged a spring 27 having one end secured to the magazine and the opposite end secured to the plug, the spring being tensionally secured s'o as to rotate the magazine within the plug.

A' stop screw 28 is adapted to be inserted 95 through an opening in the sidewall of the plug so that the end thereof will engage the links whereby to prevent rotation of the magazine. The portion of the link engaged by the pin is provided with a weakened section 10" 2 integree 'so that auch portion oit the he the rst to become and the is arranged to engage the .we is in con tact with the brush le, such constituting the one 'in circuit. Shouid such become fused the next succeeding .link is thereupon moved into position and retained by the pin ln 'the present disclosure of the invention l have arranged the magazine with sin aithough itis to he understood that 'this number may be increased or decreased as desired1 The indicia on the d isc 22 corresponds to the number of the links and such indicia is adapt edto v.rc-gister with the opening 25 termed in the cap. T`When placing the t'use in use f the magazine is nuoved so that the highest nurnber on the disc vviii register with such openings and the link corresponding thereto is then secured by the pin 2d As the tint@ becone tused the number on the disc appearing opposite the opening vvih indicate the num ber ot links which remain unbroken., The ner end oi the magazine is provided with a` ange 26 adapted to space the end ot the niag- 25 ezine away from the body and a radially en tending shoulder 26 is termed at one side o the dange .and disposed in the path o the brush 18 to stopthe iurther rotation of' the magazine after the same completes one revo- 3@ iution upon the fusing of ali of the hnks 14:.

It is obvious from the Jforegoing that my invention is susceptible to various changes and modications Without departing from the spiritl thereof or the scope ot the appended 35, claim, and I accordingiy claim aid such orins to which am entitled.

dann; A fuse plug comprising a body having eiectric contacts arranged therein, a magazine rotatably mounted therein having a tensionally retained spring attached thereto for actuating the sazne, a plurality of usabie links removably carried by said magazine in constant engagement with one oita said contacts.,

and successively movable into position for engagernent with said other contact, a slidably mounted contacting pin carried by thebody engaging said other Contact and yieldably rel tained in the path of movement of said links for engagement thereby, and stopl means eX- tending through the W211i of the body and adjustable from the outside thereof for retaining one of said links in engagement `with said contacting pin, said magazine having indieating means arranged thereon associated with the link, whereby to show which of the links is in contacting position.

In testimony whereof afhx my signature.

LEE SING FOO. 

